Question

What is the cause of formulating valley in valley topography ?

Answer 1

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Most valleys are formed by erosion of the land surface by rivers or streams over a very long period of time. Some valleys are formed through erosion by glacial ice. ... In areas of limestone bedrock, dry valleys may also result from drainage taking place underground rather than at the surface.

Answer 2

Answer:

Structural landforms are created through plate tectonics. When the earth shifts, landforms such as fold mountains, volcanoes and rift valleys can occur. Set of forces operate inside the earth act along the radius from the earth's centre to the surface and are characterised by large-scale uplift or subsidence of land area. These vertical movements are known as Continent building movements. Block mountains, basins, rift valleys are produced by these movements.

Earthquakes and volcanic activities are described as sudden forces. Volcanic eruptions result in the formation of volcanic mountains, extensive plateaus and also plains. Earthquakes cause formation of lakes.

The forces operating on the surface of the earth are called exogenic or external forces and are described as destructive forces because they cause widespread destruction through weathering and erosion of existing landforms. Landforms of these types include valleys, glacial landforms, etc.

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